Determining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae

Details Determining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae Determining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae

2007-11-27

arxiv.org/abs/0711.4196v3

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures; fixed a typo; matches version to appear in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13239.x

We estimate the solar system motion relative to the cosmic microwave background using type Ia supernovae (SNe) measurements. We take into account the correlations in the error bars of the SNe measurements arising from correlated peculiar velocities. Without accounting for correlations in the peculiar velocities, the SNe data we use appear to detect the peculiar velocity of the solar system at about the 3.5 sigma level. However, when the correlations are correctly accounted for, the SNe data only detects the solar system peculiar velocity at about the 2.5 sigma level. We forecast that the solar system peculiar velocity will be detected at the 9 sigma level by GAIA and the 11 sigma level by the LSST. For these surveys we find the correlations are much less important as most of the signal comes from higher redshifts where the number density of SNe is insufficient for the correlations to be important.

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